Abstract
This study explores a bibliometric approach to quantitatively assessing current research trends on sludge, by using the related literature published between 2000 and 2011. The articles acquired from such literature were concentrated on the general analysis by publication type and language, characteristics of articles outputs, country, subject categories and the frequency of title-words used. Over the past 12 years, there had been a notable growth trend in publication outputs, along with more participation of countries/territories. An analysis of the title-words showed that wastewater treatment was still the most hot topic in sludge research and wastewater, heavy metal, waste water treatment and anaerobic digestion were recent major topics of sludge research. Besides, membrane bioreactor technology has been advancing rapidly around the world and became an ideal way to reduce sludge production in the wastewater treatment process.
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